Ounces per quart (US) to grams per gallon (US) conversion calculator shown above calculates how many grams per gallon (US) are in 'X' ounces per quart (US) (where 'X' is the number of ounces per quart (US) to convert to grams per gallon (US)). In order to convert a value from ounces per quart (US) to grams per gallon (US) (from oz/qt to g/gal) just type the number of oz/qt to be converted to g/gal and then click on the 'convert' button.